Arrange the elements of second and third periods in increasing order of their atomic size. (i) Second Period (ii) Third Period

Let the duration of each period, when there are 9 periods a day in the school, be x minutes. The following table is obtained. Duration of each period (in minutes) 45 x Number of...

Explanation (A) Yb3+ < Pm3+ < Ce3+ < La3+ Lanthanide contraction is observed in these ions, i.e., ionic radius decreases as atomic number increases.

Second period: Neon > Fluorine > Oxygen > Nitrogen > Carbon > Boron > Beryllium > Lithium Third Period: Argon> Chlorine > Sulphur > Phosphorus > Silicon > Aluminum >Magnesium >...

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(a) Group 1: Lithium< Sodium< Potassium< Rubidium < Caesium< Francium Group 17: Fluorine < Chlorine < Bromine< Iodine < Astatine (b) Group 1: Francium Group 17: Astatine< Iodine< Bromine< Chlorine< Fluorine (c) Group 1:...

(a) Period 1 has 2 elements while period 2 and period 3 have 8 elements each. (b) Hydrogen and helium (c) The elements at the end of period 2 and Period 3...

Li, Be, F, N F < N < Be < Li .

Mg, Ca, K, Ga Ga < Mg < Ca < K .

(a) On moving from left to right in a period of the periodic table, the atomic size decreases. As we move from left to right in a period, the atomic...